diff --git a/src/Makefile.am b/src/Makefile.am
index 7cb1c20..4d8f7c3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -19,7 +19,7 @@ endif
 
 libvdpau_la_LIBADD = \
     $(DLOPEN_LIBS) \
-    $(XEXT_LIBS)
+    $(XEXT_LIBS) -lX11
 
 libvdpau_la_LDFLAGS = -version-info 1:0:0 -no-undefined
 
diff --git a/src/Makefile.in b/src/Makefile.in
index 3dd5590..965c41f 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -184,7 +184,7 @@ STRIP = @STRIP@
 VERSION = @VERSION@
 X11_CFLAGS = @X11_CFLAGS@
 X11_LIBS = @X11_LIBS@
-XEXT_CFLAGS = @XEXT_CFLAGS@
+XEXT_CFLAGS = @XEXT_CFLAGS@ -lX11
 XEXT_LIBS = @XEXT_LIBS@
 abs_builddir = @abs_builddir@
 abs_srcdir = @abs_srcdir@